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2 **Table of** **Contents:**
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4 {{toc/}}
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9 = 1. Introduction =
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12 This chapter introduces how users can change the uplinkdwell time.
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15 = 2. Default uplinkdwelltime =
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18 Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
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21 [[image:image-20220527091341-1.png]]
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24 The device default (% style="color:blue" %)**uplinkdwelltime=1**(%%), there are **SF7, SF8, SF9 and SF10**.
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26 If users want to ues **SF11 and SF12,** they need to set (% style="color:blue" %)**uplinkdwelltime=0**.
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28 Users can use AT commands to set uplinkdwell time.
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31 [[image:image-20220527091422-2.png]]
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34 [[image:image-20220527091503-3.png]]
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37 = 3. Use AT command to set uplinkdwell time =
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40 Since Dragino LoRaWAN Stack DR_LWS_005, user is able to set the uplink Dwelltime in AS923 and AU915 manual or use a application side downlink command to set it.
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42 * Use AT command: (% style="color:blue" %)**AT+DWELLT=0**(%%),  set to Uplink Dwelltime=0.
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44 * Use AT command: (% style="color:blue" %)**AT+DWELLT=1**(%%),  set to Uplink Dwelltime=1.
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46 Or via application downlink command:
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48 * Downlink Payload:** (% style="color:blue" %)0x2500(%%)**,  Set AT+DWELLT=0 to uplink.
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50 * Downlink Payload: (% style="color:blue" %)**0x2501**(%%),  Set AT+DWELLT=1 to uplink.
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